Comparative analysis of ship model hydrodynamic noise and hole cavity excitation load tests and calculation

Here, underwater noise testing was conducted for a certain ocean-going passenger ship' s bare vessel model and hydrodynamic excitation load testing was conducted for a ship model with a perforated cavity, and steady-state and transient flow field calculations at cavity were performed. It was shown that calculation curve of pulsating pressure spectrum at cavity agrees well with test curve; frequency testing values of pulsating pressure line spectrum at cavity and frequency calculation values obtained using empirical formulas are in consistent; thus, this empirical formula is suitable for estimating spectral frequencies of grid cavity line spectrum of hull under certain conditions. The statistical energy analysis (SEA) method was used to calculate medium and high-frequency flow-induced noise of a bare vessel model, and fluid excitation was exerted in the form of frequency-wavenumber power spectrum to greatly reduce flow field calculation amount and be suitable for rapid engineering estimation. Within the general scope of engineering, damping loss factor values could lead to a difference of 5. 5 dB in noise results, so damping loss factor values could more largely affect calculation results. It was necessary to form a database of material loss factor changes with variation of frequency to provide a support for rapid calculation of ship noise. © 2024 Chinese Vibration Engineering Society. All rights reserved.